When nonlethal effects of chemicals are studied, such as a chemical having neurotoxic attributes, the dose that causes 50% of the individuals to display the effect is known as the?

Ruth is 44 years old. at her medical checkup, her doctor notices that ruth's lymph nodes are enlarged. after some blood tests and a ct scan, ruth's doctor diagnoses her with ( ) , a cancer that typically starts in the lymphocytes and can spread to the bone marrow.